Developer explains Solana CPI and PDA signer mechanics through four-day build log

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A developer documented four days of building Solana programs that transfer SOL and tokens, focusing on Cross-Program Invocations (CPIs) and Program Derived Address (PDA) signers. CPIs allow one Solana program to call another, using a CpiContext that specifies the target program, required accounts, and instruction amount. PDA signers enable programs to authorize transactions autonomously using deterministic seed-based addresses, without any private key held by a human. The developer built a vault program where users deposit SOL via wallet signature and withdraw via program-controlled PDA signing, with seed mismatches blocking unauthorized access. A Token-2022 mint was also configured so only a PDA holds mint authority, demonstrating how DeFi primitives like AMMs, lending protocols, and DAO treasuries enforce rules entirely through program logic.

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